If you are using it on 3/4in wood it won't give a clean cut. It also breaks the ends and takes small chunks out of the center. Not a tight fit when assembling.
Actually it's 4.5 stars because the bit with twin cutters tends to vibrate, as though there's a slight balance problem.
I reduce the RPMs to minimize vibrations without losing the ability to make a clean cut. Once it makes contact with the workpiece it's not a problem.
There is an issue with the double-bit burning maple, but many woodworking tools tends to burn that wood. I make a cut 95% of the depth, then follow with a quick final pass at the finished dimension. Then the cut is clean.